🌋 Baking Soda Volcano
The classic science experiment · What happens and WHY · Grades K–5
🛒 What You Need
Materials
• 3 tbsp baking soda
• 1 cup white vinegar
• A few drops food coloring
• 1 tsp dish soap
• A tall container or bottle
• A tray (gets messy!)
Safety
✅ Safe for kids
✅ Adult supervision recommended
✅ Do this outside or on a tray
⚠ Vinegar can sting eyes — don't splash!
📝 Step-by-Step Instructions
Step 1 — Build your volcano (optional)
Shape modeling clay or paper-mache around your bottle to look like a volcano. Leave the opening uncovered.
Step 2 — Prep the bottle
Add 3 tablespoons of baking soda to the bottle. Add a few drops of red or orange food coloring. Add 1 tsp of dish soap.
Step 3 — Make it erupt!
Quickly pour 1 cup of vinegar into the bottle and step back! Watch it erupt with colored, foamy "lava"!
Step 4 — Make it bigger!
Add more baking soda and vinegar to make it erupt again and again! Try different amounts.
🧠 The Science Behind It!
This is a chemical reaction! When baking soda (a base called sodium bicarbonate) mixes with vinegar (an acid called acetic acid), they react to form new substances.
Baking Soda + Vinegar →
Carbon Dioxide gas + Water + Sodium Acetate
The carbon dioxide gas (CO2) is what creates all those bubbles and foam! The dish soap traps the gas bubbles, making the foam last longer. It's the same gas you breathe out and that makes soda fizzy!
🔬 Try These Variations!
MAKE IT BIGGER
Use more baking soda and vinegar. A 2-liter bottle gives a huge eruption!
WARMER VINEGAR
Warm vinegar reacts faster — does temperature affect the eruption?
NO SOAP
Try without dish soap. What's different about the bubbles?
LEMON JUICE
Try lemon juice instead of vinegar. Lemon is an acid too!
About This Science Experiment
This free interactive science experiment guide helps students learn scientific concepts through hands-on investigation. Science experiments teach the scientific method: asking questions, forming hypotheses, testing through experimentation, and analyzing results. These critical thinking skills apply to every area of learning.
Each experiment uses common household materials and includes step-by-step instructions, safety tips, and explanations of the science behind what you observe. Interactive elements let you explore the concepts virtually before or after doing the physical experiment.
How to Use
Read through the experiment steps, then try the interactive simulation. For hands-on learning, gather the materials listed and follow the instructions with an adult. Record your observations and compare them to the scientific explanation.
Last reviewed: April 2026